By Topic

Conference Proceedings National Telesystems Conference 1993

16-17 June 1993

Filter Results

Displaying Results 1 - 25 of 45
  • The RADARSAT remote sensing ground station for McMurdo station, Antarctica

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given. Under a memorandum of agreement with the Canadian Space Agency and NOAA, NASA has agreed to construct a remote sensing station and deploy it at McMurdo Base in Antarctica. The station is designed to receive the downlinked data from RADARSAT and to provide for future remote sensing applications on the Antarctica continent. The system, which was designed to meet the special ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A large W-band slotted waveguide array

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (36 KB)

    Summary form only given. Slotted arrays at millimeter-wave frequencies play an important role in commercial applications such as collision radars and synthetic vision systems. The authors describe the design, fabrication and testing of a 3-ft-long slotted waveguide array having 600 edge wall slots. The design represents a low-loss technique for achieving a high-resolution pattern and uses a standa... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A GPS solution to precision approach and landing (even in the presence of anti-spoofing)

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    Summary form only given. The ability to track quality dual-frequency P-code (code and phase) observables has been responsible for many exciting developments in global positioning system (GPS) geodesy and precision navigation. However, civilian users were confronted with the fact that P-code quality tracking will essentially disappear when the government enacts full time anti-spoofing (AS). A propr... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • INTELSAT VIII; INTELSAT's next generation satellite

    Publication Year: 1993
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    Summary form only given. The authors present a general overview of the design and key features of Intelsat's next-generation satellite, INTELSAT VIII. INTELSAT VIII will provide both C-band and Ku-band services through a complex antenna system. The 3700-kg spacecraft is based on the GE Series 7000 platform currently in production and is expected to provide over 13 years of in-orbit operational ser... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Prospects for international TVRO growth

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    Summary form only given, as follows. With the introduction at the end of 1993 of the high EIRP INTELSAT VII/VIII-A satellites, the INTELSAT network is about to enter a new phase of dramatically increased capability. Voice, data and video services will become practical on global scale to much smaller ground terminals than ever before. A similar situation occurred in the United States in the late 19... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Externally modulated optical analog links for microwave applications

    Publication Year: 1993
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (37 KB)

    Summary form only given, as follows. Fiber-optic analog links using external modulators are useful for microwave applications. They can transmit microwave signals over distances up to several kilometers with low loss and negligible dispersion. With the addition of a few more components, these links can be used in phased array antennas to steer the beam and to provide broadband adaptive nulling. Th... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Proceedings of 1993 IEEE National Telesystems Conference

    Publication Year: 1993
    Request permission for commercial reuse | PDF file iconPDF (96 KB)
    Freely Available from IEEE
  • Genesis: personal traveler information system

    Publication Year: 1993, Page(s):27 - 30
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    Construction of new freeways is coming to an end due to right-of-way, environmental, and construction cost problems. Efforts have, instead, been placed on increasing the efficiency of existing facilities through the use of current and evolving technologies. A major example of these efforts is the intelligent vehicle-highway system (IVHS). The IVHS program developed for the state of Minnesota is en... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • High resolution MMW seeker fuse processing

    Publication Year: 1993, Page(s):175 - 179
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors describe a new signal processing technique for phased arrays that can be used in near-field target imaging. This processing technique is useful to millimeter wave seekers employing planar phased arrays as a new approach to performing warhead fusing. The array operation and signal processing are similar to synthetic sampled aperture radar (SSAMAR). Through a coherent integration of all ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Advanced RF cards for fare collection

    Publication Year: 1993, Page(s):31 - 35
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Transit fare collection systems are discussed. The public transit industry has shown a strong interest in the value that smart cards can bring to the fare collection process. At the same time, the toll collection industry has migrated to radio frequency (RF) methods for advanced electronic toll collection and traffic management (ETTM) systems. The ideal solution to the fare collection problem may ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Application of aerostat radars to drug interdiction

    Publication Year: 1993, Page(s):181 - 183
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The application of aerostat radars for the purpose of detecting and tracking low flying aircraft and small ships used for drug smuggling is an example of an application of technology to nonmilitary purposes. Sophisticated coherent radars that include moving target indication (MTI) and pulse compression processing to achieve the target extraction from clutter have been adapted from military coheren... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • ATMS 2000: hybrid automation or a lights out traffic management center?

    Publication Year: 1993, Page(s):37 - 42
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Because of rapid advances in information and automation technology, traffic management center (TMC) design is in a period of rapid evolution. Larger numbers of more capable traffic and environmental sensors are being fielded. Data fusion and information processing equipment are beginning to exploit this new quantity and quality of information. Automation of routine tasks may help to moderate peaks... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Pseudo windowing for synthetic sampled aperture radar target detection

    Publication Year: 1993, Page(s):185 - 189
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The authors introduce a significant modification to the coherent integration algorithm of synthetic sampled aperture radar (SSAMAR) processing to achieve Hamming-like or cosine to the fourth-like tapering. Only pseudo Hamming or cosine to the fourth tapering is possible because the coefficients of the coherently integrated SSAMAR returns are integers. In other words, the coefficients of the return... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Multiwavelength photonic communications

    Publication Year: 1993, Page(s):15 - 20
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    The integration of multiwavelength technology into practical fiber optic communication systems is gradually becoming a reality because the required important wavelength tunable components are readily available. The author reviews several important multiwavelength system applications and briefly describes the key components, both commercially available and the state-of-the-art, for those systems. T... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • GPS relative navigation for automatic spacecraft rendezvous and capture

    Publication Year: 1993, Page(s):155 - 168
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    NASA, in collaboration with the European Space Agency (ESA), is planning a space experiment involving the space shuttle and two spacecraft in low Earth orbit to demonstrate autonomous rendezvous and capture (AR&C). The results of the preliminary design of a global positioning system (GPS)-based relative navigation filter for AR&C are presented. The domain of operation of the GPS relative n... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The ARINC veracious differential reference station concept and status

    Publication Year: 1993, Page(s):143 - 152
    Cited by:  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    An important aspect that must be considered in the design of any differential global positioning system (DGPS) is the degree of integrity inherent in the differential corrections provided by that system. Currently available DPGS systems provide only partial integrity due to one or more of the following reasons: they are restricted to single operating mode integrity, they are capable of failure det... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • The search and rescue communications channel-past, present and future

    Publication Year: 1993, Page(s):131 - 138
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    From a macroscopic viewpoint, the underlying concept for search and rescue (SAR) involving radio beacons is a communications channel. The communications channel should establish a two-way link by providing confirmation of the message received. The author outlines the different aspects of the SAR communications channel from its very beginnings to the current COSPAS-SARSAT satellite system, and he a... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Performance of coded QPSK modulation for the delivery of MPEG-2 stream compared to analog FM modulation

    Publication Year: 1993, Page(s):121 - 125
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    The author compares the performance of coded quadrature phase-shift keying (QPSK) and analog frequency modulation (FM) for the delivery of video services by satellite. The proposed digital video scheme uses the Motion Picture Experts Group (MPEG-2) video compression with a concatenated coding. The performance of both systems is compared. The digital video scheme is shown to be more robust in noise... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A passive millimeter wave camera for landing under low visibility conditions

    Publication Year: 1993, Page(s):109 - 115
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    Passive millimeter wave (PMMW) focal plane array cameras are new sensors capable of imaging the forward scene under fog and low-visibility conditions at video frame rates. PMMW imaging sensors measure the blackbody radiation naturally emitted from the imaged scene. These cameras promise to be an effective aid, or an alternative, to existing technology for aircraft landing and surface operations un... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • MMW technology for enhanced situation awareness/enhanced vision systems

    Publication Year: 1993, Page(s):97 - 99
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    Millimeter wave (MMW) radar systems are now demonstrating the ability to image airport environments in fog. The authors discuss the use of MMW radar technology to provide pilots with enhanced vision and enhanced situation awareness. One of the first steps in providing an autonomous aircraft is the Enhanced Vision System (EVS). This system consists of a heads-up display (HUD) and an imaging MMW rad... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of various PCS spectrum allocation schemes on the ability to share spectrum with incumbent microwave users in the 1850-1990 MHz band

    Publication Year: 1993, Page(s):45 - 53
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    The success of personal communication services (PCS) rests in the ability to share spectrum with incumbent microwave users in the 1850-1990-MHz band. Spectrum allocations from 20 MHz to 40 MHz per PCS licensee are being considered by the FCC. While it may be possible to make some spectrum available by negotiating relocation agreements with certain of the microwave users in a given MSA, local gover... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Modern cable TV network, the ideal platform for PCS

    Publication Year: 1993, Page(s):59 - 64
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    Modern cable TV distribution plants offer many advantages in providing personal communication services (PCS) to the public. The author reviews the evolution of cable TV architectures from an all coaxial cable tree and branch to a fiber-rich double star network. The cable TV industry has invested considerable capital and resources to improve the reliability and the quality of their distribution pla... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Velocity matched filtering/coherent integration of ultrawideband pulse trains

    Publication Year: 1993, Page(s):191 - 195
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The development of optically activated semiconductor switches has advanced to the point where they are ready for implementation in radar systems. Extended detection range is possible when the switch is operated at high pulse repetition frequencies combined with integration of multiple pulse returns. Coherent integration of the returns from moving targets is described, based on real signal processi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characterization of the PACSAT file broadcast system

    Publication Year: 1993, Page(s):71 - 79
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    Since January 1990, amateur radio operators around the world have had the opportunity to use several low-Earth-orbit satellites providing store-and-forward communications services. The author focuses on the broadcast mode of operation as implemented on the PACSAT-1 and UoSAT-5 amateur radio satellites in 1992. The evolutionary process leading to the broadcast mode of operation is given along with ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Detection of signals with a fractal model

    Publication Year: 1993, Page(s):209 - 213
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    A common problem in signal processing is the detection of signals in noisy environments. The author presents a fractal model to detect signals where detection is linked to the geometric complexity of the signal. He illustrates the utility of this approach to different signal types such as sinusoids and speech. It is shown that this approach is extendible to detection of two-dimensional data, such ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.